What is ground contact time in running?
Ground contact time is how long each foot stays on the ground on every step, measured in milliseconds by a watch pod or chest strap, and shorter at the same pace usually means a quicker, more efficient stride, though the number itself depends on speed more than anything.
What ground contact time means
From the moment your foot touches the ground to the moment it leaves. That is one contact. It is measured in milliseconds. A quick, springy stride has short contact. A slow, heavy stride sits on the ground longer.
Some watches also report ground contact time balance, the split between left and right foot. A large difference between sides can be a clue that one leg is doing something different.
What a watch pod measures
A foot pod, a chest strap or a wrist sensor reads acceleration many times a second. It detects the jolt of landing and the lift of toe-off and times the gap. That is a real measurement. It is also affected by where the sensor sits, how firmly it is attached and the firmware doing the guessing.
So the number is useful for one runner over time on one device. It is less useful for comparing two runners or two watches.
What is a good ground contact time?
It depends on speed more than anything else. Faster running means shorter contact for everyone. Elite runners at race pace touch the ground very briefly. Recreational runners at easy pace stay down longer. Comparing your easy run to an elite race number tells you nothing.
The useful comparison is you against you, at the same pace, over weeks. If contact gets shorter at the same speed, the stride is getting quicker. If it gets longer late in a run, you are tiring. See why running form breaks down when tired.
What makes contact long
Two things you can see on video. A foot landing well ahead of the hip, which brakes and then has to wait for the body to pass over it. And a low cadence, which means a long slow stride. Fix those and contact time tends to fall on its own. Read how to stop overstriding.
What Caden measures, and what it does not
Caden does not measure ground contact time. It works from a 2D phone video with no sensor on your body, and timing a contact to the millisecond from a 30 or 60 frame per second clip would be a guess. So it does not report one.
What video does show is the cause. The Where your foot lands dial grades how far ahead of the hip the foot lands. The cadence chip shows steps per minute. The Foot strike and Toe-off frames show what the foot is doing at each end of the contact. Those are the things you change to shorten contact. See how running form analysis works.
How to check it with Caden
- Tap Run a new analysis and set up a side-on shot. Film at the pace you care about.
- Open the Where your foot lands dial. A low score means the foot lands ahead of the hip, which is the main cause of long contact.
- Read the cadence chip. Low cadence means a long slow stride. Raise it by 5 percent and re-check in three to four weeks.
- In Stats, track foot landing and cadence over time. If both improve at the same pace, contact time on your watch should fall with them.
FAQ
Does Caden measure ground contact time?
No. It measures from video without a body sensor, so it reports landing reach, cadence and the foot strike frames instead. Those are the causes you can change.
What is a good ground contact time for a beginner?
There is no single number. It depends on speed and on the device. Track your own number at the same pace over weeks and look for it to fall.
Why is my ground contact time uneven between legs?
Often a small difference is normal. A large one can be a clue that one leg lands or pushes differently. Film from the side and compare the two feet at foot strike.